Terebratulina d’Orbigny, 1847

Bitner, Maria Aleksandra & Logan, Alan, 2016, Recent Brachiopoda from the Mozambique-Madagascar area, western Indian Ocean, Zoosystema 38 (1), pp. 5-41 : 16

Genus Terebratulina d’Orbigny, 1847

TYPE SPECIES. — Anomia retusa Linnaeus, 1758 , by subsequent designation ( Brunton et al. 1967: 176).

Terebratulina meridionalis Jackson, 1952 ( Fig. 8 ; Table 7)

Terebratulina meridionalis Jackson, 1952: 13 , pl., fig. 8. — Cooper 1973a: 10-11, pl. 3, figs 43-45. — Hiller 1991: 441; 1994: 778. — Zezina 2010: 1186.

Terebratulina caput-serpentis var. septentrionalis – Davidson 1880: 33-36, pl. 1, figs 6-9.

MATERIAL EXAMINED. — Mozambique Channel. MAINBAZA, stn CC 3175, 1 bivalved specimen.

South Madagascar. ATIMO VATAE, stn TB01, 3 bivalved specimens. — StnTP18, 1 bivalved specimen.— Stn DW 3519, 8 bivalved specimens. — Stn DW 3530, 21 bivalved specimens. — Stn DW 3531, 1 dorsal valve. — Stn DW 3532, 15 bivalved specimens, 2 ventral valves, 2 dorsal valves. — Stn DW 3533, 1 bivalved specimen. — Stn DW 3534, 9 bivalved specimens, 1 dorsal valve. — Stn CP 3573, 1 bivalved specimen.

DEPTH RANGE. — 22- 307 m.

MEASUREMENTS. — See Table 7.

REMARKS

Terebratulina is one of the most widely distributed and diverse brachiopod genera in Recent oceans. However, while 23 species are known globally ( Logan 2007), only three species have been identified from the Indian Ocean , mostly from South Africa ( Jackson 1952; Cooper 1973a; Hiller 1986, 1991, 1994). The investigated specimens correspond well with those described as T. meridionalis Jackson, 1952 from western South Africa. The shell is small, elongate oval in outline. The surface is covered with ribs which are strong in posterior and lateral parts but becoming weak or indistinct in the anterior half ( Fig. 8D, I ). The inner socket ridges are prominent with roughened surface acting as a cardinal process ( Fig. 8 F-H). The loop forms a broad ring.

Figures

FIG. 8. — Terebratulina meridionalis Jackson,1952; A-E, dorsal views of complete specimens,and enlargements (C, E) of umbonal part to show details of the beak (MNHN IB-2013-50-52), South Madagascar, north of Sainte Luce, ATIMO VATAE, stn DW 3530, 80-86 m; F-H, interior of dorsal valve (MNHN IB-2013-53), inner (F) and oblique (G) views, and enlargement (H) of posterior part to show details of loop and cardinalia, South Madagascar, north of Sainte Luce, ATIMO VATAE, stn DW 3532,86-87 m; I, dorsal view of complete specimen (MNHN IB-2013-54), Mozambique Channel, Maputo transect, MAINBAZA, stn CC 3175,155-165 m. All SEMs. Scale bars: A, B, D, F, G, I, 2 mm; C, E, H, 1 mm.